Tubular fountain pen point



Oct. 5, 1937. A.JEDE| E Er AL l 2,094,921

TUBULAB. FOUNTAIN-.PEN POINT I Filed Feb. 2s. 1957 Patented Oct. 5, 1937 the-Main, Germany,

assignors' to W. C.

Heraeus G. -m. b. H., Hanau-on-the-Main, Germany, a corporation of Germany Application February 23, 1937, Serial No.'127,018 In Germanyv March 9, 1936 11 Claims.

The present invention is concerned with Writing tubes or tubularv fountain pen points and is adapted to considerably increase the duration of life and the utility of such articles. According to the invention the end of the writing tube is provided with a small ring of an extremely hard ink resisting alloy the inner surface of which ring forms a continuation of the innersurface of the main portion of the tube of about l the same cross section and the outer surface of which is arched or curved. For instance, the inner surface of the ring of a cylindrical tube may be a concentric continuation of -the inner surface of the main portion with equal circular cross l` section. The outer surface of the ring is arched or curved and may, for instance, be spherical orv in the form of an elliptic or other rotary body. In a modification it may have the form of an obtuse cone.

'I'he writing tubes according to the invention are, in a manner known per se, combined with the other parts of a fountain-pen, for instance, the reservoir for the ink and the small rod provided for guiding the ink.

The main portion of the writing tube may consist of precious metals, for instance gold, si1ver,

, platinum or palladium alloys orof low metals provided they are ink resisting, for instance, rust-proof steels. The ring at the end of the writing tube consists of an extremely hard ink resisting alloy. This alloy must be of such hard'- ness that it may only be worked by grinding or similar operations. For instance, the special alloys used hitherto for making the nibs of pens are utilized, i. e., alloys of low metals, as chromium, molybdenum, tungsten or tantalum, or alloys having a content of precious metals, for example, metals of the platinum group.

The main portion of the tube and the ring 40 consisting of the hard ink resisting alloy may be welded or soldered together. The welding may for instance be carried out in the following..

manner:

A rod snugly fitting the writing tube is inserted into'the front end of the latter. r Loosely arranged upon this rod are a number of small rings of hard ink resisting metal. The ilrst of these rings is pushed along the rod until it just bears against the end of the writing tube. In this position the ring is welded or soldered to the tube, while the -rod remains in situ. After welding of the ring,

the rod is withdrawn from the end of the tube. The face of contact between the main portion of the writing tube and the small ring, .consisting -ot the special alloy, naturallyis irregular when (Cl. 1Z0-44) the two parts are connected together by welding. 'f This, however, is of no importance for the use of the fountain-pen.

I`n the accompanyingdrawing one embodiment of the invention is shown by Way of example.

In the drawing:

Fig. 1 is a view of a fountain-pen provided with a writing tube according to the invention, and

Fig. 2 shows a view on an enlarged scale illustrating the manner of attaching the small ring to the writing tube.

The fountain-pen is designated with I, the writing tube with 2 and the small ring, consist'- ing of an extremely hard ink resisting alloy, and fixed to the end of the writing tube,2 is designated with 3. As indicated already the drawing moreover, shows the manner of attaching the ring to the tube. Mounted upon a rod 5 adapted to be inserted into the writing tube v2 are rings 3 and 4 of the special alloy which are welded to the end of the writing tube in the manner described above.

The novel writing tubes are extremely durable. It is true, that it is well known to reinforce the nibs of pens of fountain-pens by a granule orbead of a special alloy. Such reinforcement of a writing tube by means of a granule or bead does, however, not answer the purpose as during writing not always the same side of the tube is used.

Very small amounts of -the valuable hard metal alloys only are required, if the new writing tubes are made for instance in the above 'mentioned manner.

'I'he new writing tubes are particularly adapted for making carbon copies when writing.

Afteran extended use, the new writing tubes, moreover, effect a perfectly `uniform flow of ink as no corrosion occurs and the end remains perfectly smooth. 'I'he invention is particularly valuable from a mechanical point of view as the demands on the metals used for making the main portion of the tube are not as high as in the devices of the prior art.

What we claim is:

1. A writing tube comprising a main portion and a small ring .of an extremely hard ink refsisting alloy, carried by the end of said main portion in sucha manner, thatthe inner surface of said small ring forms a continuation of the inner surfacey ofsaid main portion of about the same cross section, the outer surface of said small ring being arched or bulged.

2. A writing tube comprising a main portion and a small ring of an extremely hard ink re- Y sisting alloy containing precious metals carried by the end of said main portion in such'a manner, that the inner surface of said small ring forms a continuation of the inner surface of said main portion of .about the same cross section, the outer surface of said small ring being arched or bulged.

3. A Writing tube comprising a main portion and a small ring of an extremely hard, ink resisting, low metal alloy carried by the end of the said main portion in such a manner, that the inner surface of said small ring forms a continuation of the inner surface of said main portion of about the same cross section, the outer surface of said small ring being arched or bulged.

4. A Writing tube comprising a main portion and a small ring of an extremely hard ink resisting alloy welded to the end of said main portion in such a manner, that the inner surface of said small ring forms a continuation of the inner surface of said main portion of about the same cross v section, the outer surface of said small ring being arched or bulged.

5. A writing tube comprising a main portion and a small ring of an extremely hard ink resisting alloy soldered to the end of said main portion in such a manner, that the inner surface of said small ring forms a continuation of the inner surface of said main portion of about the same cross section, the outer surface of said small ring being arched or bulged.

6. A tubular fountain pen member comprising a tubular metallic member adapted to conduct ink from the ink supply of a fountain pen to the operating end of the pen, and an annulus of hard ink-resisting alloy carried by the operating end of said tubular member and provided with the operating surface for said member.

7. A tubular fountain 'pen member comprising a tubular metallic member adapted to conduct ink from the ink supply of a fountain pen to the operating end of the pen, and an annulus of hard ink-resistingalloy carried by the operating end of said tubular member and provided with the operating surface for said'member, said annulus being welded to the end of said tubular metallic member.

.a tubular metallic member adapted to conduct ink from the ink supply of a -fountain pen to the operating end of the pen, and an annulus of hard ink-resisting alloy carried by the operating end of said tubular member and provided With the operating surface for said member, said annulus having a partially spherical operating surface at its free end.

10. A tubular fountain pen member comprising a tubular metallic member adapted to conduct ink from the ink supply of a fountain pento the operating end of the pen, and an annulus of hard ink-resisting alloy carried by the operating end of said tubular member, said annulus being of substantially the same shape and size as the end of' said tubular member at the point of securement thereto.

11. The method of constructing tubular fountain pen points which comprises providing a tubular metal member of minute size adapted to conduct ink from the fountain pen from the source of ink operating to the point of the pen, slidably supporting said tubular member upon a cylindrical metal support, slidably supporting an annulus of hard ink-resisting alloy on said support, bringing the annulus and tubular member into juxtaposition and securing them together by a metallic joint.

ALFRED JEDELE. WERNER LUCKOW. 

